i had done some searching and came up with this stunning 92 epic ultimate, and it had a set of these levers on it. so was curious if it was introduced that early.
i wouldn't say an ad in a magazine is a clear indication of when a product was first introduced to the market, which is what i was hoping to determine.
the reference on mombat is interesting in that they are called Altek Shark Fin levers. i was doing search by Altek canti/cantilever brake levers, as well as Altek BL-20: